Okay guys if you think I've tried to figure out exactly what it is and it's not well described I'll try to be clear. Think of it as a mini trap. I bought this to divert the sink in a 1992 RV because the sink drain went into the black water tank and was only 6 gallons. The black water tank and gray water are much easier to drain so I wanted it to be grey. I attached it to the bottom of the sink and routed the hose down the shower drain which is turning gray. The female threads (1 1/2") did NOT fit the bottom of the sink (those threads were too big) BUT I went to local hardware and for $1.99 for the adapter it worked. This unit works great, no leaks ..Hope this helps.May our Savior be Jesus Christ with all my fellow campers/boundockers!God bless!
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